Witch Detonate Dead/Sacrifice creating spirit issues

While using a Detonate Dead build while using sacrifice in order to detonate my own minions, very frequently the spirit allocated for the dying minion is not depleted again when the minion responds. I am using Skeleton Brutes and clerics to revive the minions. The issue arises when the minion tries to revive it says that spirit requirements are not met. It is easily fixed by unallocating and reallocating the spirit, but in important combats or when you are being mobbed it becomes very difficult to keep dps up.